Abstract
The authors proposed a high-quality and small-capacity lecture-video-file creating system for traditional chalk-and-talk based lectures: it will be used for distance e-learning. Examining the features of the lecturing scene, the authors ingeniously employ two kinds of image-capturing equipment having complementary characteristics: one is a digital video camera with a low resolution and a high frame rate, and the other is a digital still camera with a high resolution and a very low frame rate. By integrating the two kinds of images with image processing, we can produce course materials with greatly reduced file capacity: the course materials satisfy the requirements both for the temporal resolution to see a lecturer's point-indicating actions and for the high spatial resolution to read small written letters. As a result of an experiment, the e-lecture using the proposed file creating system was confirmed to be effective for providing sufficiently legible lecture images at remote places.
